TM4SF1: a new vascular therapeutic target in cancer (original) (raw)

Abstract

Transmembrane-4 L-six family member-1 (TM4SF1) is a small plasma membrane glycoprotein that regulates cell motility and proliferation. TM4SF1 is an attractive cancer target because of its high expression in both tumor cells and on the vascular endothelial cells lining tumor blood vessels. We generated mouse monoclonal antibodies against human TM4SF1 in order to evaluate their therapeutic potential; 13 of the antibodies we generated reacted with extracellular loop-2 (EL2), TM4SF1’s larger extracellular, lumen-facing domain. However, none of these antibodies reacted with mouse TM4SF1, likely because the EL2 of mouse TM4SF1 differs significantly from that of its human counterpart. Therefore, to test our antibodies in vivo, we employed an established model of engineered human vessels in which human endothelial colony-forming cells (ECFC) and human mesenchymal stem cells (MSC) are incorporated into Matrigel plugs that are implanted subcutaneously in immunodeficient nude mice. We modified the original protocol by (1) preculturing human ECFC on laminin, fibronectin, and collagen-coated plates, and (2) increasing the ECFC/MSC ratio. These modifications significantly increased the human vascular network in Matrigel implants. Two injections of one of our anti-TM4SF1 EL2 monoclonal antibodies, 8G4, effectively eliminated the human vascular component present in these plugs; they also abrogated human PC3 prostate cancer cells that were incorporated into the ECFC/MSC Matrigel mix. Together, these studies provide a mouse model for assessing tumor xenografts that are supplied by a human vascular network and demonstrate that anti-TM4SF1 antibodies such as 8G4 hold promise for cancer therapy.

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Acknowledgments

We thank Dr Ruei-Zeng Lin for teaching the Matrigel implantation, Kelly Seidl for capturing confocal image, and Andrew Zukauskas for participating in hybridoma screening. This work was supported by NIH Grant P01 CA92644 and by a contract from the National Foundation for Cancer Research.

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Authors and Affiliations

  1. The Center for Vascular Biology Research, Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, RN-280D, Boston, MA, 02215, USA
    Chi-Iou Lin, Anne Merley, Tracey E. Sciuto, Dan Li, Ann M. Dvorak, Harold F. Dvorak & Shou-Ching S. Jaminet
  2. Department of Surgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
    Juan M. Melero-Martin

Authors

  1. Chi-Iou Lin
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  2. Anne Merley
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  3. Tracey E. Sciuto
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  4. Dan Li
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  5. Ann M. Dvorak
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  6. Juan M. Melero-Martin
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  7. Harold F. Dvorak
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  8. Shou-Ching S. Jaminet
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Correspondence toHarold F. Dvorak or Shou-Ching S. Jaminet.

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Lin, CI., Merley, A., Sciuto, T.E. et al. TM4SF1: a new vascular therapeutic target in cancer.Angiogenesis 17, 897–907 (2014). https://doi.org/10.1007/s10456-014-9437-2

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